Gas-engine.



G; D. EIGHMIE.

GAS ENGINE. Ar PucATlou FILED AUG-26. 1915.

Patented; July 24, 1917.

llNlTED STATES PATENT QFFICE.

GEORGE D EIGI-I1VLIE, OF YORK, N. Y.

GAS-ENGINE.

Specification of Letters Patent. 1

Patented July 24,1917.

Applicationfiled August 26, 1315. ,g serialNo. 47,412. v

To aZZ wZwm/z't may concern .1

Be it known that I, Gnonen D. EIGI-IMLE, a citizen-of the United States,residingat New York, in the county ot New York and State of New York,have invented certain new and useful Impnovements in; GassEn gines-otwhich theiollowingis a specificatioln reference beingrhad therein tothe-accompanying drawing.

My present; invention relates panticularly. to two-cycle gas englnes andhasior ltSObthe novel arrangement of the ports'ltha'ough which the agaseous charge 1 is introduced into the explosionschamber ;1n theinterior of the cylinder; and also i. the invention consists in numerousdetails and peculiarities. in; [the construction arrangement 1 andicomblnat on of the various. parts, substant ally asnvill be hereinafterdescribed and then more particularly pointed out in the appended-claims.

In theaocompanying. drawing illustrating my invention;

Figure 1 is a vertical section of 1ny. im-.

proved gas engine Fig.2 is-a cross-section on the line 2, 2 of.

Fig. 1;

F1gl 3 1s an enlarged vertical section showing the arrangementofthenports for delivering the mixture from the. interior 1 of j thepiston into the cylinder the partsbe ngin e the position that theyoccupy ust p1;ior tom the opening of the 5 ports.- but while: they are.still closed.

Fig. 4. is a similar verticalsectioi showing thesame partsintllQjlJQSltlOIlwtllflt they 00-- cupy whentheports are open.

Similar characters of. reference design-ate corresponding partsthroughout the, different figures of the; drawing.

1 denotes the; cylinder or working charm I ber of theengine whichmay beoflany de sired length, anddiameter, and-whichweX tends downwardly and41st supported on [the crank casing 2, through which extends the.

crank shaft 3, 1 having l thereon, a ;;crank 4,

provided with crank-pin 5, to which is at taohed theconnecting-und-fiwwh-ich is fas toned to the lworking pistontffi, whichlatter is shown as otthe trunk typeot piston.

The lower of the cylinder l gust,

above the crank case 2, is surrounded by the annular supplyport 8 whichreceivesthe ex plosrve mixture atsonie suitable point, .as,

foninstance, the inlet opening 9,"and dehvers the same into theinteriorof oylinden 1 at; theopening 10 ofsaidannular port 8,

said opening 10. being. of circular form and extend ng entlrely aroundthe cyhnden so.

that; a largechar-ge may be quickly introduced into; the cylinder, thesame being con ducive to a high speed operation of the en; gineThe-cylinder-l is also. provided at a short distance from the annulanport 10- with an exhaust .port 11, which also extends completely aroundthe same, so as to 1313 05,; vlde a largeport area. Vhen thetrunkplston7 movesi upwardly sufficiently .far; to open the port 10- a cl'large 0ttheexplosivev mixture; willobviously be introduced into.

its reverse stroke it drops below the exhaust port 11, this exhaust port11; will'beopened so. as. to. allow -01" the. eXit -of the -spentproducts otthewexplosion. Thusrit will {be seen th-atIthe pistonQ7 inits. top posi-tion overruns the inlet. port; and in its bottom,

position; overruns the exhaust port.

The p1 ston...7 .is provided with I an up,- wardly -extend1ng tubularextension. 12

which communicates with the .a hollow in; i This tubular projecteriorotth'e piston tion. 12: fits snugly in. a dome 13;.Inounted upon thecylinder head 14. Dome 13 uand piston extension. 12 have a sliding fitand form a gas tight-andair tight jointbetween thern Within the dome 13:is a plug 15 securely held. therein. andproviding an annularspacebetween it andthe dome 13 which is used to guide the tubular pistonextension.

12 duringits recip-rocations. saidpluglo, is held in position by anysuitablemeans. On the lower-end of the plug 15. and below itsgbottorn 16is-a: tubularextension 17 which enters theapiston, extension. 12: with asliding fit forming, a gastight joint and telescopes neatly with saidpiston extension so. that the.

latter during its. reo-ipr'ocations inay slide eas ly lip-and down overthis tubular pro:

jeotion, 17,.as also between it and the dome 13.. and between theplug 15anduthe dome, 13,. all as clearly shownin the. figures of the drawing...

Theatubular extension- 12 of the pistongis provided. near .itsupper end,with ,an en,.

circling port 1 18 extending, completely aroimd it with thee/ir eeptionof a dewribsy,

the interior otthe piston T, and wheneon.

7 part 17 intact with the plug 16, and as this tubular part 117communicates with the interior of the piston extension 12, it will: beobvious that the gaseous contents of the piston willemerge through theport 19 when the upper end of the tube 12 drops below' I said port 19,and will then pass into the working chamber ofthe cylinder 1 between theend of the tube 12 and the cylinder head letwhen said tube 12 dropsbelow the head 14. By referring to Figs. 1 and 3it will be observed thatthe tubular part 12 of the piston is on its down stroke and is. at apoint where the upper end of the tube 12 is about to be released fromthe cylinder head let and the port 18 is about to drop below the lowerend of the part 17, it being noted that the said lower end or" the tube17 is provided with a plurality otfingers or projections 20, whichengage the interior of the tube 12 so that the lower end of the part 17is kept in engagement with the tube 12 when the port 18 is open, saidprojections 20in efiect providing a port between them which coincideswith theport 18 when the tube 12 drops far enough down;

therefore, when the tube 12 drops below the piston head 14-, the gaseouscontents of the piston will not only pass through the port 19 andthroughthe gap between the end of tube 12 and the cylinder head 14, but willalso passbetween the projections" 20 and through the port 18 likewiseinto'the work- 111g chamber of thecylinder. I have moreover found it ofconsiderable advantage to provide the outer wall of the tubularextension 17 which fits against the inside surface of the tube 12 with ahorizontal encirclnig,

groove 21, which forms a port through which, when the piston is on itsdownward stroke, a part of the explosive mixture will be introduced fromthe interior of the piston into the working chamber. This port 21 openssimultaneously with the opening of the other ports, all as shown in Fig.1 where all these ports are seen to be open and allowing the explosivemixture to pass'from the interior of the tube 12 into the workingchamber of the cylinder. In Figs. 1 and 3, all three ports are shown asclosed.

In view of the foregoing description,the operation of my improved gasengine will be readily understood without any additional detailedexplanation with reference weenie to such, operation. In the wall of thecylinder 1 is a spark plug 22 or some equivalent device for igniting themixture. This mixture 01 air and gas is supplied to the engine at theinlet 9 through the annular port 8 and the inlet port 10, and thence,into the interior of thepiston 7 when the latter is at the upper end ofits stroke and its tubular extension 12 is within the dome 13 and isoccupying the annular space between the dome 13 and the'plug 15, atwhich time ohviously the exhaust port 11 is closed and also the transferports for delivering the explosivc mixture from the interior of thepiston into the working, chamber. When the explosion takes place and thepreviously compressed charge drives the pistonto the lowest limit of itsstroke, covering the annular port 10 and opening the exhaust port 11,the charge which has just been exploded will escape through said port11, and the fresh. mixture which was introduced through the port10 intothe cylinder and which fills the interior of the piston, will, as soonas the piston drops so that the telescoping parts 17 and 12 will openthe transfer ports 18, 19 and 21, be carried into the working chamber oithe cylinder, which will be filled above the piston with the new charge,the entrance of the new charge assisting inthe expulsion of the spentproducts through the exhaust port 11. As soon as this new charge isintroduced, the piston will begin its upward movement on the next cycleand will compress the charge so introduced, at the same time closing thetransfer ports and the same cycle or operations will proceed as before.

Having thus described my invention, what 1 claim as new and desire tosecure by Letters Patent, is: c 1. In a two-cycle gas engine, thecombination witha cylinder and its head, of a central tubular extensionon said cylinder head, a hollowpiston working within said cylinderandrhaving a tubular extension which enters a tubular extension on thecylinder head and is provided with a port near the end thereof, throughwhich port the explo- 'sive mixtureis discharged from the interior ofthe piston'into the explosion chamber when said port is open, adischarge being alsomade past the end of said piston exten sion when itdrops below the cylinder head, and a plug located within the cylinderhead extension so as to leave an annular space betweenit and the wall ofsaid extension, said plug on its lower end having a tubular part with "aport, said tubular part entering the,

tubular extension of the piston and covering and uncovering the porttherein, and said port 1n the tubular part on the plug discharging thegaseous contents of the piston when the upper end of the piston tubedrops below the same, all of said ports and parts 1'.

being thus arranged with the cylinder to operate a plurality of openingssimultaneously.

2. In a two-cycle gas engine, the combination with a cylinder and itshead, of a hollow piston working within said cylinder, said pistonhaving a tubular extension provided with a port through which theexplosive mixture is discharged from the interior of the piston into theexplosion chamber when the port is open, a discharge being also madepast the end of said piston extension when it drops below the cylinderhead, a guide device on the end of the cylinder consisting of twomembers between which is an annular guideway which receives theaforesaid ported piston tube, and a tubular part carried by the guidedevice and provided with a port and engaging the tubular extension 011the piston, said port in said tubular part discharging the gaseouscontents of the piston when the upper end of the piston tube drops belowsaid port, all the ports and parts being arranged with the cylinder headto operate a plurality of openings simul- 'taneously.

3. In a two-cycle gas engine, the combination of a cylinder having inletand exhaust ports, a hollow trunk piston working in said cylinder andhaving a tubular extension pro vided with a port near its end, anannular guide in the cylinder head consisting of a tubular extension onsaid head and a plug supported in said extension and having a closedend, and a tube attached to said plug and provided with a port in itswall and also a grooved bypass or port, said tubular extension beingembraced by the piston extension in its reciprocatory movement.

l. In a two-cycle gas engine, the combination with a cylinder havinginlet and exhaust ports and a concentric tubular extension on the headthereof, of a piston working within said cylinder and covering anduncovering the inlet and exhaust ports during its reciprocatorymovement, said piston having a tubular extension which enters thetubular extension on the cylinder and is provided with a port near theend thereof, a plug located within the cylinder extension so as to leavean annular guideway for the piston extension, said plug carrying atubular part having aport in its wall and also a grooved by-pass orport, said tubular part entering the tubular extension of the piston,all of said ports being arranged so as to open when the end of thetubular piston eX- tension withdraws from the annular guideway anddisengages itself temporarily from the cylinder head to allow thegaseous mixture to pass from the interior of the piston into theexplosion chamber.

5. In a two-cycle gas engine, the combination of a cylinder and itshead, a piston working in said cylinder and having a tubular extensionprovided with a port, through which port the explosive mixture isdischarged from the interior of the piston at times, a discharge beingalso made past the end of said piston tube when it is released from thecylinder head, a tubular extension on the cylinder head, a plug in saidextension and concentric therewith so as to leave an annular space thatreceives and guides the tubular extension of the piston, a tubular partcarried by the said plug and entering the piston extension so as tocover and uncover the port therein, said plug tube having a port in itswall through which the explosive mixture from the interior of the pistonmay at times be transferred to the working chamber of the piston, saidports and parts being arranged with the cylinder head to operate aplurality of openings simultaneously.

In testimony whereof I affix my signature.

GEORGE D. EIGI-IMIE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

